US7538732B2 - Antenna structure and radio communication apparatus including the same - Google Patents

Antenna structure and radio communication apparatus including the same Download PDF

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Publication number
US7538732B2
US7538732B2 US11/772,380 US77238007A US7538732B2 US 7538732 B2 US7538732 B2 US 7538732B2 US 77238007 A US77238007 A US 77238007A US 7538732 B2 US7538732 B2 US 7538732B2
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Prior art keywords
radiation electrode
feed radiation
capacitance
feed
resonant frequency
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US11/772,380
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US20080122714A1 (en
Inventor
Takashi Ishihara
Kengo Onaka
Shoji Nagumo
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Murata Manufacturing Co Ltd
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Murata Manufacturing Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
    • H01Q9/0442—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with particular tuning means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/30—Arrangements for providing operation on different wavebands
    • H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
    • H01Q5/342—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes
    • H01Q5/357—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes using a single feed point
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/30—Arrangements for providing operation on different wavebands
    • H01Q5/378—Combination of fed elements with parasitic elements
    • H01Q5/392—Combination of fed elements with parasitic elements the parasitic elements having dual-band or multi-band characteristics
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
    • H01Q9/42—Resonant antennas with feed to end of elongated active element, e.g. unipole with folded element, the folded parts being spaced apart a small fraction of the operating wavelength

Definitions

  • the present invention relates to an antenna structure provided in a radio communication apparatus, such as a portable telephone, and a radio communication apparatus including the antenna structure.
  • multiband antennas configured such that a single antenna is capable of performing radio wave communication in a plurality of frequency bands.
  • a radiation electrode performing an antenna operation has a plurality of resonant modes with different resonant frequencies
  • multiband antennas that are capable of performing radio wave communication in a plurality of frequency bands utilizing a plurality of resonant modes of the radiation electrode have been available.
  • a multiband antenna utilizing a plurality of resonant modes of a radiation electrode uses a resonance in a fundamental mode with the lowest frequency among the plurality of resonant modes of the radiation electrode and a resonance in a higher-order mode with a frequency higher than that in the fundamental mode.
  • the radiation electrode is designed such that the resonance in the fundamental mode of the radiation electrode occurs in a lower frequency band among a plurality of frequency bands set for radio wave communication and that the resonance in the higher-order mode of the radiation electrode occurs in a higher frequency band of the settings for radio wave communication.
  • a feed radiation electrode is connected to a circuit for radio communication and is three-dimensionally provided inside or on a surface of a dielectric base member.
  • the feed radiation electrode performs an antenna operation in a fundamental mode with the lowest resonant frequency among a plurality of resonant frequencies of the electrode and an antenna operation in a higher-order mode with a resonant frequency higher than the resonant frequency in the fundamental mode.
  • the feed radiation electrode has a spiral shape in which the feed radiation electrode extends in a direction away from a feed point connected to the circuit for radio communication and then turns to approach the feed point.
  • One end of the feed radiation electrode defines a feed end connected via the feed point to the circuit for radio communication, and a spiral end, which is the other end of the feed radiation electrode, defines an open end.
  • a ground-level voltage region in the higher-order mode located closer to the open end with respect to the feed end of the feed radiation electrode is set in advance as a capacitance-loading portion.
  • a capacitance-loading conductor is provided in and extends from the capacitance-loading portion in a direction approaching the feed end and forms a capacitance for adjusting the resonant frequency in the fundamental mode between the feed end of the feed radiation electrode and the capacitance-loading portion.
  • the position of a capacitance-loading portion is set in advance in a feed radiation electrode portion between the feed end and the open end, and a capacitance-loading conductor that extends from the feed end in a direction approaching the capacitance-loading portion and that forms a capacitance for adjusting the resonant frequency in the fundamental mode between the feed end of the feed radiation electrode and the capacitance-loading portion is provided at the feed end of the feed radiation electrode.
  • a capacitance-loading conductor that extends from a capacitance-loading portion toward the feed end is provided in the capacitance-loading portion set in advance in a feed radiation electrode portion between the feed end and the open end, another capacitance-loading conductor that extends from the feed end toward the capacitance-loading portion is provided at the feed end of the feed radiation electrode, and a capacitance for adjusting the resonant frequency in the fundamental mode is formed between the capacitance-loading conductor provided in the capacitance-loading portion and the capacitance-loading conductor provided at the feed end.
  • a non-feed radiation electrode that is provided with a space between the non-feed radiation electrode and the feed radiation electrode and that is electromagnetically coupled to the feed radiation electrode to produce a multiple-resonance state is provided inside or on the surface of the dielectric base member, and the non-feed radiation electrode is configured to perform an antenna operation in a fundamental mode with the lowest resonant frequency among a plurality of resonant frequencies of the electrode and an antenna operation in a higher-order mode with a resonant frequency higher than the resonant frequency in the fundamental mode.
  • the non-feed radiation electrode has a spiral shape in which the non-feed radiation electrode extends in a direction away from a conduction point connected to a ground and then turns to approach the conduction point.
  • One end of the non-feed radiation electrode defines a short end grounded via the conduction point to the ground, and a spiral end, which is the other end of the non-feed radiation electrode, defines an open end.
  • a capacitance-loading portion set in advance in a non-feed radiation electrode portion between the short end and the open end, a capacitance-loading conductor that extends from the capacitance-loading portion in a direction approaching the short end and that forms a capacitance for adjusting the resonant frequency in the fundamental mode between the short end of the non-feed radiation electrode and the capacitance-loading portion is provided.
  • a non-feed radiation electrode that is provided with a space between the non-feed radiation electrode and the feed radiation electrode and that is electromagnetically coupled to the feed radiation electrode to produce a multiple-resonance state is provided inside or on the surface of the dielectric base member.
  • the non-feed radiation electrode is configured to perform an antenna operation in a fundamental mode with the lowest resonant frequency among a plurality of resonant frequencies of the electrode and an antenna operation in a higher-order mode with a resonant frequency higher than the resonant frequency in the fundamental mode.
  • the non-feed radiation electrode has a spiral shape in which the non-feed radiation electrode extends in a direction away from a conduction point connected to a ground and then turns to approach the conduction point.
  • One end of the non-feed radiation electrode defines a short end grounded via the conduction point to the ground, and a spiral end, which is the other end of the non-feed radiation electrode, defines an open end.
  • the position of a capacitance-loading portion is set in advance in a non-feed radiation electrode portion between the short end and the open end.
  • a capacitance-loading conductor extends from the short end in a direction approaching the capacitance-loading portion and forms a capacitance for adjusting the resonant frequency in the fundamental mode between the short end of the non-feed radiation electrode and the capacitance-loading portion is provided at the short end of the non-feed radiation electrode.
  • a non-feed radiation electrode is provided with a space between the non-feed radiation electrode and the feed radiation electrode and is electromagnetically coupled to the feed radiation electrode to produce a multiple-resonance state is provided inside or on the surface of the dielectric base member.
  • the non-feed radiation electrode is configured to perform an antenna operation in a fundamental mode with the lowest resonant frequency among a plurality of resonant frequencies of the electrode and an antenna operation in a higher-order mode with a resonant frequency higher than the resonant frequency in the fundamental mode.
  • the non-feed radiation electrode has a spiral shape in which the non-feed radiation electrode extends in a direction away from a conduction point connected to a ground and then turns to approach the conduction point.
  • One end of the non-feed radiation electrode defines a short end grounded via the conduction point to the ground, and a spiral end, which is the other end of the non-feed radiation electrode, defines an open end.
  • a capacitance-loading conductor extends from a capacitance-loading portion toward the short end and is provided in the capacitance-loading portion set in advance in a non-feed radiation electrode portion between the short end and the open end.
  • An other capacitance-loading conductor extends from the short end toward the capacitance-loading portion and is provided at the short end of the non-feed radiation electrode.
  • a capacitance for adjusting the resonant frequency in the fundamental mode is formed between the capacitance-loading conductor provided at the short end and the capacitance-loading conductor provided in the capacitance-loading portion.
  • a radio communication apparatus includes an antenna structure described above.
  • a capacitance-loading conductor is connected to one or both of a feed end and a capacitance-loading portion set in advance.
  • the capacitance-loading conductor extends from one of the feed end of the feed radiation electrode and the capacitance-loading portion toward the other one of the feed end of the feed radiation electrode and the capacitance-loading portion and forms a capacitance for adjusting a resonant frequency in a fundamental mode between the feed end of the feed-radiation electrode and the capacitance-loading portion.
  • the ground-level voltage region in the higher-order mode of the feed radiation electrode is a region in which a voltage level that is equal to the ground level or that is nearest to the ground level is achieved.
  • the ground-level voltage region in the higher-order mode is a region closer to a maximum voltage region.
  • the voltage difference between the feed end of the feed radiation electrode and the ground-level voltage region in the higher mode is large, and the capacitance between the feed end and the ground-level voltage region is large.
  • the capacitance between the feed end and the ground-level voltage region in the higher-order mode greatly affects the resonant frequency in the fundamental mode.
  • the voltage difference between the feed end of the feed radiation electrode and the ground-level voltage region in the higher-order mode is small, and the capacitance between the feed end and the ground-level voltage region is small.
  • the capacitance between the feed end and the ground-level voltage region hardly affects the resonant frequency in the higher-order mode.
  • the capacitance-loading conductor used in the present invention is provided only for adjusting the capacitance between the feed end of the feed radiation electrode and the capacitance-loading portion (the ground-level voltage region), and the capacitance-loading conductor does not perform an antenna operation together with the feed radiation electrode.
  • the capacitance-loading conductor can be designed with high flexibility.
  • the feed radiation electrode is designed with consideration of the electrical length and the like of the feed radiation electrode such that the resonant frequency in the higher-order mode of the feed radiation electrode is adjusted to a set value set in advance.
  • the capacitance-loading conductor is designed such that the resonant frequency in the fundamental mode of the feed radiation electrode is adjusted to a set value set in advance.
  • the resonant frequency in the fundamental mode can be adjusted with almost no change in the resonant frequency in the higher-order mode of the non-feed radiation electrode.
  • the capacitance between the feed end (or the short end) and the capacitance-loading portion is adjusted to be larger by using the capacitance-loading conductor. Accordingly, the resonant frequency in the fundamental mode can be reduced. That is, the resonant frequency in the fundamental mode can be reduced without reducing the electrode width of the feed radiation electrode or the non-feed radiation electrode. If the electrode width is reduced, current concentration occurs. Thus, conductive loss increases. However, in the present invention, the electrode width does not need to be reduced in order to reduce the resonant frequency in the fundamental mode. Thus, current concentration is released, and an increase in the conductive loss can be suppressed.
  • the capacitance-loading conductor since a capacitance-loading conductor is provided, a higher capacitance is achieved between the feed end (or the short end) of the feed or non-feed radiation electrode and the capacitance-loading portion (for example, the ground-level voltage region in the higher-order mode), compared with a case where the capacitance-loading conductor is not provided.
  • the capacitance formed between the ground, and the feed end (or the short end) of the feed or non-feed radiation electrode and the capacitance-loading portion is reduced. That is, since electromagnetic coupling between the ground, and the feed end (or the short end) of the feed or non-feed radiation electrode and the capacitance-loading portion is weak, the Q-value of the radiation electrode is reduced.
  • the frequency bandwidth for radio communication can be increased.
  • an antenna structure according to the present invention and a radio communication apparatus including the antenna structure are capable of improving the antenna characteristics.
  • At least one of feed and non-feed radiation electrodes has a simple configuration in which a capacitance-loading conductor is connected to one or both of a feed end (or a short end) and a capacitance-loading portion. With such a simple configuration, the above-mentioned excellent advantages can be achieved.
  • FIG. 1 a is an illustration for explaining an antenna structure according to a first embodiment.
  • FIG. 1 b is a model diagram for explaining a configuration example of a feed radiation electrode forming the antenna structure according to the first embodiment.
  • FIG. 2 a is a graph showing an example of voltage distribution in a fundamental mode of a radiation electrode.
  • FIG. 2 b is a graph showing an example of voltage distribution in a higher-order mode of the radiation electrode.
  • FIG. 3 is a graph showing an example of return loss characteristics of the antenna structure shown in FIG. 1 a.
  • FIG. 4 a is a model diagram showing another configuration example of the feed radiation electrode.
  • FIG. 4 b is a model diagram showing still another configuration example of the feed radiation electrode.
  • FIG. 4 c is a model diagram showing still another configuration example of the feed radiation electrode.
  • FIG. 4 d is a model diagram showing still another configuration example of the feed radiation electrode.
  • FIG. 5 is a perspective view showing still another configuration example of the feed radiation electrode and a non-feed radiation electrode.
  • FIG. 6 is an illustration schematically showing a current path in the fundamental mode of the feed radiation electrode shown in FIG. 1 b.
  • FIG. 7 a is an illustration schematically showing another example of the current path in the fundamental mode of the feed radiation electrode.
  • FIG. 7 b is a model diagram showing a configuration example of the feed radiation electrode in which the current in the fundamental mode is electrically connected by the example of the current path shown in FIG. 7 a.
  • FIG. 8 a is an illustration schematically showing still another example of the current path in the fundamental mode of the feed radiation electrode.
  • FIG. 8 b is a model diagram showing a configuration example of the feed radiation electrode in which the current in the fundamental mode is electrically connected by the example of the current path shown in FIG. 8 a.
  • FIG. 9 a is an illustration for explaining an antenna structure according to a second embodiment.
  • FIG. 9 b is a model diagram showing a side view of the antenna structure shown in FIG. 9 a.
  • FIG. 1 a is an exploded view schematically showing an antenna structure according to a first embodiment.
  • the antenna structure 1 according to the first embodiment includes an antenna 2 .
  • the antenna 2 is provided in a non-ground region Zp of a circuit board 3 of a radio communication apparatus (for example, a portable telephone). That is, in the circuit board 3 , the non-ground region Zp in which a ground is not formed is disposed on one end, and a ground region Zg in which a ground 4 is formed is disposed next to the non-ground region Zp.
  • the antenna 2 is surface-mounted in the non-ground region Zp of the circuit board 3 .
  • the antenna 2 includes a dielectric base member 6 of a rectangular-parallelepiped shape.
  • the antenna 2 also includes a feed radiation electrode 7 and a non-feed radiation electrode 8 that are provided on the dielectric base member 6 .
  • the dielectric base member 6 is formed of resin materials including a material for improving the dielectric constant. Metal plates forming the feed radiation electrode 7 and the non-feed radiation electrode 8 are provided on the dielectric base member 6 by insert molding.
  • a slit 10 is formed in the metal plate of the feed radiation electrode 7 , and the feed radiation electrode 7 is shaped by bending the metal plate.
  • the feed radiation electrode 7 has a shape in which a current path in a fundamental mode of the feed radiation electrode 7 , shown by a solid line I in an enlarged view of FIG. 1 b , has a spiral shape.
  • the feed radiation electrode 7 has a spiral shape in which the feed radiation electrode 7 extends in a direction away from a feed point ( 7 A) connected to a high-frequency circuit 11 for radio communication of a radio communication apparatus and then turns to approach toward the feed point.
  • One end 7 A of the feed radiation electrode 7 defines a feed end connected via the feed point to the high-frequency circuit 11 for radio communication, and the spiral end, which is the other end 7 B of the feed radiation electrode 7 , defines an open end.
  • the spiral shape is not limited to a round shape.
  • the spiral shape may be a square spiral or the like other than the round shape.
  • the feed radiation electrode 7 is configured to perform an antenna operation in a fundamental mode with the lowest resonant frequency among a plurality of resonant frequencies of the feed radiation electrode 7 and an antenna operation in a higher-order mode (for example, a third-order mode) with a resonant frequency higher than that in the fundamental mode.
  • FIG. 2 a shows voltage distribution in the fundamental mode of the feed radiation electrode 7 .
  • FIG. 2 b shows voltage distribution in the higher-order mode (for example, the third-order mode).
  • an electrical length (that is, an electrical length from the feed end 7 A to the open end 7 B of the feed radiation electrode 7 ) for adjusting the resonant frequency in the higher-order mode (for example, the third-order mode) of the feed radiation electrode 7 to a resonant frequency set in advance (in other words, for producing a resonance in a frequency band assigned in advance higher than that in the fundamental mode) is calculated in advance, and the slit length of the slit 10 , the electrode width, and the like of the feed radiation electrode 7 are designed to achieve this electrical length.
  • a ground-level voltage region (see regions surrounded by dotted lines a in FIGS. 1 b and 2 ), which is a portion electrically closer to the open end 7 B with respect to the feed end 7 A and which has a voltage level in the higher-order mode that is equal to a ground level or that is nearest to the ground level, is set in advance as a capacitance-loading portion.
  • a capacitance-loading conductor 12 is connected to the capacitance-loading portion.
  • the capacitance-loading conductor 12 extends from the ground-level voltage region (the capacitance-loading portion) ⁇ of the feed radiation electrode 7 toward the feed end while penetrating inside the dielectric base member 6 .
  • the capacitance-loading conductor 12 is provided in order to increase the capacitance between the feed end 7 A of the feed radiation electrode 7 and the ground-level voltage region (the capacitance-loading portion) ⁇ in the higher-order mode.
  • the capacitance between the feed end 7 A of the feed radiation electrode 7 and the ground-level voltage region ⁇ in the higher-order mode defines a fundamental-mode resonant frequency adjustment capacitance for adjusting the resonant frequency in the fundamental mode of the feed radiation electrode 7 to a set value.
  • the non-feed radiation electrode 8 is disposed with a space between the non-feed radiation electrode 8 and the feed radiation electrode 7 and is electromagnetically coupled to the feed radiation electrode 7 to produce a multiple-resonance state.
  • the non-feed radiation electrode 8 has a configuration approximately similar to that of the feed radiation electrode 7 . That is, the non-feed radiation electrode 8 has a spiral shape in which the non-feed radiation electrode 8 extends in a direction away from a conduction point connected to the ground 4 of the circuit board 3 and then turns to approach the conduction point, and a current path in the fundamental mode of the non-feed radiation electrode 8 has a spiral shape.
  • One end 8 A of the non-feed radiation electrode 8 defines a short end grounded via the conduction point to the ground 4 , and the spiral end, which is the other end 8 B of the non-feed radiation electrode 8 , defines an open end. Similar to the feed radiation electrode 7 , the non-feed radiation electrode 8 performs an antenna operation in the fundamental mode and an antenna operation in the higher-order mode. Current distribution in each of the fundamental mode and the higher-order mode of the non-feed radiation electrode 8 is similar to current distribution in each of the fundamental mode and the higher-order mode of the feed radiation electrode 7 .
  • an electrical length for example, an electrical length from the short end 8 A to the open end 8 B of the non-feed radiation electrode 8 for adjusting the resonant frequency in the higher-order mode (for example, the third-order mode) of the non-feed radiation electrode 8 to a resonant frequency set in advance is calculated in advance, and the slit length of a slit 9 , the electrode width, and the like of the non-feed radiation electrode 8 are designed so as to achieve the electrical length.
  • a ground-level voltage region ⁇ which has a voltage level in the higher-order mode of the non-feed radiation electrode 8 that is equal to a ground level or that is nearest to the ground level, is set in advance as a capacitance-loading portion.
  • a capacitance-loading conductor 13 is connected to the capacitance-loading portion.
  • the capacitance-loading conductor 13 has a shape similar to that of the capacitance-loading conductor 12 connected to the feed radiation electrode 7 . That is, the capacitance-loading conductor 13 extends toward the short end 8 A of the non-feed radiation electrode 8 while penetrating inside the dielectric base member 6 .
  • the capacitance-loading conductor 13 increases the capacitance between the short end 8 A of the non-feed radiation electrode 8 and the ground-level voltage region (the capacitance-loading portion) ⁇ in the higher-order mode.
  • the capacitance between the short end 8 A of the non-feed radiation electrode 8 and the ground-level voltage region (the capacitance-loading portion) ⁇ defines a fundamental-mode resonant frequency adjustment capacitance for adjusting the resonant frequency in the fundamental mode of the non-feed radiation electrode 8 to a value set in advance.
  • the antenna structure according to the first embodiment is configured as described above.
  • the feed radiation electrode 7 and the non-feed radiation electrode 8 are provided with the capacitance-loading conductors 12 and 13 , respectively.
  • the capacitance between the feed end (short end) of each of the feed radiation electrode 7 and the non-feed radiation electrode 8 and the ground-level voltage region (the capacitance-loading portion) in the higher-order mode can be adjusted easily.
  • the resonance frequencies in the fundamental mode of the feed radiation electrode 7 and the non-feed radiation electrode 8 can be adjusted easily with almost no change in the resonant frequencies in the higher-order mode of the feed radiation electrode 7 and the non-feed radiation electrode 8 .
  • a solid line A in FIG. 3 represents the antenna structure 1 including the capacitance-loading conductor 13 , which is characteristic in the first embodiment.
  • a dotted line B in FIG. 3 represents an antenna structure having a configuration similar to that of the antenna structure 1 according to the first embodiment with the exception that the capacitance-loading conductor 13 is not provided.
  • a sign a in the graph represents a frequency band in the higher-order mode of the feed radiation electrode 7
  • a sign b represents a frequency band in the higher-order mode of the non-feed radiation electrode 8
  • a sign c represents a frequency band in the fundamental mode of the feed radiation electrode 7
  • a sign d represents a frequency band in the fundamental mode of the non-feed radiation electrode 8 .
  • the resonant frequency in the fundamental mode d of the non-feed radiation electrode 8 can be adjusted to be lower without changing the resonant frequency in the higher-order mode a of the feed radiation electrode 7 and the resonant frequency in the higher-order mode b of the non-feed radiation electrode 8 .
  • the capacitance-loading conductor 12 is connected to the ground-level voltage region ⁇ in the higher-order mode of the feed radiation electrode 7
  • the capacitance-loading conductor 13 is connected to the ground-level voltage region ⁇ in the higher-order mode of the non-feed radiation electrode 8
  • the capacitance-loading conductors 12 and 13 extend toward the feed end of the feed radiation electrode 7 and the short end of the non-feed radiation electrode 8 .
  • a capacitance-loading conductor only needs to increase the capacitance between the ground-level voltage region (the capacitance-loading portion) ⁇ or ⁇ in the higher-order mode of the feed radiation electrode 7 or the non-feed radiation electrode 8 and the feed end (or the short end).
  • a capacitance-loading conductor 14 may be connected to the feed end 7 A of the feed radiation electrode 7 , and the capacitance-loading conductor 14 may extend toward the ground-level voltage region ⁇ in the higher-order mode of the feed radiation electrode 7 .
  • a capacitance-loading conductor may be connected to the short end of the non-feed radiation electrode 8 , and the capacitance-loading conductor may extend toward the ground-level voltage region ⁇ in the higher-order mode of the non-feed radiation electrode 8 .
  • the capacitance-loading conductor 12 may be connected to the ground-level voltage region ⁇ in the higher-order mode of the feed radiation electrode 7 , and the capacitance-loading conductor 14 may be connected to the feed end 7 A.
  • the capacitance-loading conductor 12 extends toward the feed end, and the capacitance-loading conductor 14 extends toward the ground-level voltage region ⁇ in the higher-order mode of the feed radiation electrode 7 .
  • a capacitance is formed between the capacitance-loading conductors 12 and 14 .
  • This capacitance is equal to the capacitance formed between the feed end of the feed radiation electrode 7 and the ground-level voltage region ⁇ in the higher-order mode, and the capacitance defines a fundamental-mode resonant frequency adjustment capacitance.
  • a capacitance-loading conductor may be connected to the ground-level voltage region ⁇ in the higher-order mode of the non-feed radiation electrode 8 , and a capacitance-loading conductor may be connected to the short end.
  • the capacitance-loading conductors extend in a direction approaching each other. The capacitance-loading conductors form a fundamental-mode resonant frequency adjustment capacitance between the short end of the non-feed radiation electrode 8 and the ground-level voltage region ⁇ in the higher-order mode.
  • the capacitance-loading conductor 12 connected to the ground-level voltage region ⁇ in the higher-order mode of the feed radiation electrode 7 is embedded in the dielectric base member 6 .
  • the capacitance-loading conductor 12 may not be embedded in the dielectric base member 6 .
  • the capacitance-loading conductor 13 of the non-feed radiation electrode 8 may not be embedded in the dielectric base member 6 .
  • the capacitance-loading conductor 12 may be bent outwards at a position in the middle of extension of the capacitance-loading conductor 12 of the feed radiation electrode 7 .
  • the capacitance-loading conductor 13 of the non-feed radiation electrode 8 may have a similar configuration.
  • the capacitance-loading conductor 12 is connected to the ground-level voltage region ⁇ in the higher-order mode of the feed radiation electrode 7 on the upper surface of the dielectric base member 6 .
  • the capacitance-loading conductor 12 may be connected anywhere in the ground-level voltage region in the higher-order mode of the feed radiation electrode 7 .
  • the capacitance-loading conductor 12 may be connected to a feed radiation electrode portion formed on a side surface of the dielectric base member 6 in the ground-level voltage region in the higher-order mode of the feed radiation electrode 7 . The same applies to the non-feed radiation electrode 8 .
  • positions to which capacitance-loading conductors are connected may be different between the feed radiation electrode 7 and the non-feed radiation electrode 8 .
  • the capacitance-loading conductor 12 may be connected to the ground-level voltage region ⁇ in the higher-order mode, and in the non-feed radiation electrode 8 , a capacitance-loading conductor may be connected to the short end.
  • the feed radiation electrode 7 and the non-feed radiation electrode 8 have shapes approximately symmetrical to each other in the example shown in FIG. 1 a
  • the feed radiation electrode 7 and the non-feed radiation electrode 8 may have the same shapes, as shown in FIG. 5 .
  • the feed radiation electrode 7 shown in FIGS. 1 a and 1 b has a shape in which a current in the fundamental mode flowing in the feed radiation electrode 7 defines a current path I of a spiral shape, as shown in a model diagram of FIG. 6 .
  • the feed radiation electrode 7 may have a shape (see, for example, FIG. 7 b ) that defines a current path I of a spiral shape, as shown in a model diagram of FIG. 7 a .
  • the feed radiation electrode 7 may have a shape (see, for example, FIG. 8 b ) that defines a current path I of a spiral shape, as shown in a model diagram of FIG. 8 a .
  • non-feed radiation electrode 8 may have a shape similar to that of the feed radiation electrode 7 shown in FIG. 7 b or 8 b or may have a shape symmetrical to that of the feed radiation electrode 7 shown in FIG. 7 b or 8 b.
  • the antenna 2 (the feed radiation electrode 7 and the non-feed radiation electrode 8 ) is provided in the non-ground region Zp of the circuit board 3 such that part of the antenna 2 (the feed radiation electrode 7 and the non-feed radiation electrode 8 ) protrudes from the non-ground region Zp of the circuit board 3 toward the outside of the board.
  • a configuration similar to that of the first embodiment is provided.
  • the feed radiation electrode 7 and the non-feed radiation electrode 8 of the antenna 2 has the configuration shown in FIG. 1 a .
  • the feed radiation electrode 7 and the non-feed radiation electrode 8 may have any of the above-mentioned configurations other than the configuration shown in FIG. 1 a.
  • the antenna 2 (the feed radiation electrode 7 and the non-feed radiation electrode 8 ) is provided in the non-ground region Zp of the circuit board 3 such that part of the antenna 2 (the feed radiation electrode 7 and the non-feed radiation electrode 8 ) protrudes from the non-ground region Zp of the circuit board 3 toward the outside of the board.
  • the space between the ground region Zg and each of the feed radiation electrode 7 and the non-feed radiation electrode 8 can be increased.
  • a negative effect of ground is reduced, an increase in the frequency bandwidth for radio communication and an improvement in the antenna efficiency can be achieved. Accordingly, a miniaturized and lower-profile antenna structure can be achieved.
  • the third embodiment relates to a radio communication apparatus.
  • the radio communication apparatus according to the third embodiment is characterized by including the antenna structure according to the first or second embodiment.
  • As a configuration other than the antenna structure in the radio communication apparatus there are various possible configurations. Any configuration may be adopted, and the explanation of the configuration is omitted here.
  • the antenna structure according to the first or second embodiment has been explained above, the explanation of the antenna structure according to the first or second embodiment is omitted here.
  • the present invention is not limited to each of the first to third embodiments, and various other embodiments are possible.
  • the non-feed radiation electrode 8 in addition to the feed radiation electrode 7 , is provided on the dielectric base member 6 .
  • the non-feed radiation electrode 8 may be omitted.
  • the non-feed radiation electrode 8 similarly to the feed radiation electrode 7 , the non-feed radiation electrode 8 has a shape in which a current path in the fundamental mode has a spiral shape, and a capacitance-loading conductor for achieving a capacitance for adjusting the resonant frequency in the fundamental mode between the short end and the ground-level voltage region in the higher-order mode is formed.
  • the resonant frequency can be easily adjusted.
  • the non-feed radiation electrode 8 may not be provided with a capacitance-loading conductor, which is characteristic in each of the first to third embodiments.
  • a configuration in which the feed radiation electrode 7 is not provided with a capacitance-loading conductor and in which the non-feed radiation electrode 8 is provided with a capacitance-loading conductor may be provided.
  • ground-level voltage regions in the higher-order mode of the feed radiation electrode 7 and the non-feed radiation electrode 8 are set as capacitance-loading portions.
  • a capacitance-loading portion may be set in an appropriate position of a radiation electrode portion between the feed end (or the short end) and the open end.
  • a slit is formed in a planer electrode of each of the feed radiation electrode 7 and the non-feed radiation electrode 8 so that a current path in the fundamental mode of each of the radiation electrodes 7 and 8 has a spiral shape.
  • a linear or strip-shaped electrode may have a spiral shape.
  • each of the feed radiation electrode 7 and the non-feed radiation electrode 8 is provided on a surface of the dielectric base member 6 .
  • the open end of each of the feed radiation electrode 7 and the non-feed radiation electrode 8 may be embedded within the dielectric base member 6 .
  • an appropriate portion set in advance of each of the feed radiation electrode 7 and the non-feed radiation electrode 8 may be partially embedded in the dielectric base member 6 .
  • a single feed radiation electrode 7 and a single non-feed radiation electrode 8 are provided on the dielectric base member 6 .
  • a plurality of feed radiation electrodes 7 and a plurality of non-feed radiation electrodes 8 may be provided on the dielectric base member 6 .
  • An antenna structure according to the present invention is capable of performing radio communication in a plurality of frequency bands utilizing a plurality of resonant modes of a radiation electrode.
  • the antenna structure according to the present invention is effectively provided in a radio communication apparatus performing radio communication in a plurality of frequency bands.
  • a radio communication apparatus according to the present invention is provided with an antenna structure having a configuration that is characteristic in the present invention, and miniaturization in the antenna structure can be easily achieved.
  • the radio communication apparatus according to the present invention is suitably applicable to a miniaturized radio communication apparatus.

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100127936A1 (en) * 2008-11-24 2010-05-27 Qinjiang Rao Multiple frequency band antenna assembly for handheld communication devices
US20100277378A1 (en) * 2008-01-17 2010-11-04 Murata Manufacturing Co., Ltd. Antenna
US20100321256A1 (en) * 2009-06-18 2010-12-23 Murata Manufacturing Co., Ltd. Antenna and radio communication device
US20110133993A1 (en) * 2009-12-09 2011-06-09 Tdk Corporation Antenna device
US20130076579A1 (en) * 2011-09-28 2013-03-28 Shuai Zhang Multi-Band Wireless Terminals With Multiple Antennas Along An End Portion, And Related Multi-Band Antenna Systems
US9583824B2 (en) 2011-09-28 2017-02-28 Sony Corporation Multi-band wireless terminals with a hybrid antenna along an end portion, and related multi-band antenna systems
USD824885S1 (en) * 2017-02-25 2018-08-07 Airgain Incorporated Multiple antennas assembly
US11093812B2 (en) * 2018-09-05 2021-08-17 Murata Manufacturing Co, Ltd RFIC module, RFID tag, and article

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4645614B2 (ja) * 2007-03-29 2011-03-09 株式会社村田製作所 アンテナ構造およびその製造方法および無線通信装置
CN101675557B (zh) 2007-05-02 2013-03-13 株式会社村田制作所 天线构造以及具有该天线的无线通信装置
US7714795B2 (en) 2007-08-23 2010-05-11 Research In Motion Limited Multi-band antenna apparatus disposed on a three-dimensional substrate, and associated methodology, for a radio device
ATE534164T1 (de) * 2007-08-23 2011-12-15 Research In Motion Ltd Mehrbandantennenanordnung angeordnet auf einem dreidimensionalen substrat
US7623074B2 (en) * 2008-01-19 2009-11-24 Auden Techno Corp. Multi-band antenna
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WO2009147884A1 (fr) * 2008-06-06 2009-12-10 株式会社村田製作所 Antenne et dispositif de communication sans fil
WO2009147883A1 (fr) * 2008-06-06 2009-12-10 株式会社村田製作所 Antenne et dispositif de radiocommunication
JP2010057048A (ja) * 2008-08-29 2010-03-11 Panasonic Corp アンテナ装置
JP4645729B2 (ja) * 2008-11-26 2011-03-09 Ｔｄｋ株式会社 アンテナ装置、無線通信機、表面実装型アンテナ、プリント基板、並びに表面実装型アンテナ及びプリント基板の製造方法
TWI351789B (en) * 2008-12-12 2011-11-01 Acer Inc Multiband antenna
JP2012034157A (ja) * 2010-07-30 2012-02-16 Sony Corp 通信装置並びに通信システム
CN102856635B (zh) * 2011-06-27 2016-05-04 光宝电子(广州)有限公司 多频天线及具有该多频天线的电子装置
CN106575816B (zh) * 2014-07-24 2019-08-16 弗拉克托斯天线股份有限公司 电子设备的超薄发射系统
CN113948853B (zh) * 2021-09-15 2024-05-03 深圳大学 贴片天线及无线电设备
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Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0938158A2 (fr) 1998-02-20 1999-08-25 Nokia Mobile Phones Ltd. Antenne
US6177908B1 (en) * 1998-04-28 2001-01-23 Murata Manufacturing Co., Ltd. Surface-mounting type antenna, antenna device, and communication device including the antenna device
EP1122812A2 (fr) 2000-02-04 2001-08-08 Murata Manufacturing Co., Ltd. Antenne montable en surface et appareil de communication utilisant celle-ci
JP2001217631A (ja) 2000-02-04 2001-08-10 Murata Mfg Co Ltd 表面実装型アンテナおよびその調整方法および表面実装型アンテナを備えた通信装置
EP1146590A2 (fr) 2000-04-11 2001-10-17 Murata Manufacturing Co., Ltd. Antenne montable en surface et dispositif sans fil utilisant celle-ci
US20020075190A1 (en) 2000-10-09 2002-06-20 Indra Ghosh Multiband microwave antenna
US20020196192A1 (en) 2001-06-20 2002-12-26 Murata Manufacturing Co., Ltd. Surface mount type antenna and radio transmitter and receiver using the same
JP2004166242A (ja) 2002-10-23 2004-06-10 Murata Mfg Co Ltd 表面実装型アンテナおよびそれを用いたアンテナ装置および通信装置
JP2004201281A (ja) 2002-12-16 2004-07-15 Samsung Electro Mech Co Ltd 無線ｌａｎアンテナ及びこれを具備した無線ｌａｎカード
JP2005117082A (ja) 2003-10-02 2005-04-28 Murata Mfg Co Ltd アンテナ構造およびそれを備えた通信機
US7136020B2 (en) * 2003-11-12 2006-11-14 Murata Manufacturing Co., Ltd. Antenna structure and communication device using the same
US20070257850A1 (en) * 2005-01-08 2007-11-08 Kengo Onaka Antenna Structure and Radio Communication Apparatus Including the Same

Patent Citations (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0938158A2 (fr) 1998-02-20 1999-08-25 Nokia Mobile Phones Ltd. Antenne
US6177908B1 (en) * 1998-04-28 2001-01-23 Murata Manufacturing Co., Ltd. Surface-mounting type antenna, antenna device, and communication device including the antenna device
EP1122812A2 (fr) 2000-02-04 2001-08-08 Murata Manufacturing Co., Ltd. Antenne montable en surface et appareil de communication utilisant celle-ci
JP2001217631A (ja) 2000-02-04 2001-08-10 Murata Mfg Co Ltd 表面実装型アンテナおよびその調整方法および表面実装型アンテナを備えた通信装置
US20010048390A1 (en) 2000-02-04 2001-12-06 Murata Manufacturing Co., Ltd. Surface mount antenna and communication device including the same
EP1146590A2 (fr) 2000-04-11 2001-10-17 Murata Manufacturing Co., Ltd. Antenne montable en surface et dispositif sans fil utilisant celle-ci
US20020030626A1 (en) 2000-04-11 2002-03-14 Murata Manufacturing Co., Ltd. Surface-mounted antenna and wireless device incorporating the same
US20020075190A1 (en) 2000-10-09 2002-06-20 Indra Ghosh Multiband microwave antenna
US20020196192A1 (en) 2001-06-20 2002-12-26 Murata Manufacturing Co., Ltd. Surface mount type antenna and radio transmitter and receiver using the same
US6657593B2 (en) * 2001-06-20 2003-12-02 Murata Manufacturing Co., Ltd. Surface mount type antenna and radio transmitter and receiver using the same
JP2004166242A (ja) 2002-10-23 2004-06-10 Murata Mfg Co Ltd 表面実装型アンテナおよびそれを用いたアンテナ装置および通信装置
US6950072B2 (en) 2002-10-23 2005-09-27 Murata Manufacturing Co., Ltd. Surface mount antenna, antenna device using the same, and communication device
JP2004201281A (ja) 2002-12-16 2004-07-15 Samsung Electro Mech Co Ltd 無線ｌａｎアンテナ及びこれを具備した無線ｌａｎカード
JP2005117082A (ja) 2003-10-02 2005-04-28 Murata Mfg Co Ltd アンテナ構造およびそれを備えた通信機
US7136020B2 (en) * 2003-11-12 2006-11-14 Murata Manufacturing Co., Ltd. Antenna structure and communication device using the same
US20070257850A1 (en) * 2005-01-08 2007-11-08 Kengo Onaka Antenna Structure and Radio Communication Apparatus Including the Same

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PCT/JP2005/022100, International Search Report dated Feb. 14, 2006.
PCT/JP2005/022100, Written Opinion (with English translation) dated Feb. 14, 2006.

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100277378A1 (en) * 2008-01-17 2010-11-04 Murata Manufacturing Co., Ltd. Antenna
US8289225B2 (en) * 2008-01-17 2012-10-16 Murata Manufacturing Co., Ltd. Multi-resonant antenna having dielectric body
US7911392B2 (en) * 2008-11-24 2011-03-22 Research In Motion Limited Multiple frequency band antenna assembly for handheld communication devices
US20100127936A1 (en) * 2008-11-24 2010-05-27 Qinjiang Rao Multiple frequency band antenna assembly for handheld communication devices
US20100321256A1 (en) * 2009-06-18 2010-12-23 Murata Manufacturing Co., Ltd. Antenna and radio communication device
US8508417B2 (en) 2009-06-18 2013-08-13 Murata Manufacturing Co., Ltd. Antenna and radio communication device
US8525732B2 (en) * 2009-12-09 2013-09-03 Tdk Corporation Antenna device
US20110133993A1 (en) * 2009-12-09 2011-06-09 Tdk Corporation Antenna device
US20130076579A1 (en) * 2011-09-28 2013-03-28 Shuai Zhang Multi-Band Wireless Terminals With Multiple Antennas Along An End Portion, And Related Multi-Band Antenna Systems
US9583824B2 (en) 2011-09-28 2017-02-28 Sony Corporation Multi-band wireless terminals with a hybrid antenna along an end portion, and related multi-band antenna systems
US9673520B2 (en) * 2011-09-28 2017-06-06 Sony Corporation Multi-band wireless terminals with multiple antennas along an end portion, and related multi-band antenna systems
USD824885S1 (en) * 2017-02-25 2018-08-07 Airgain Incorporated Multiple antennas assembly
US11093812B2 (en) * 2018-09-05 2021-08-17 Murata Manufacturing Co, Ltd RFIC module, RFID tag, and article

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EP1835563A4 (fr) 2008-07-16
JPWO2006073034A1 (ja) 2008-06-12
CN101099265B (zh) 2012-04-04
EP1835563A1 (fr) 2007-09-19
JP4158832B2 (ja) 2008-10-01
WO2006073034A1 (fr) 2006-07-13
CN101099265A (zh) 2008-01-02
US20080122714A1 (en) 2008-05-29

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